Do you think it's custom for that car?
No, they actually make hitches for them. My buddy has a C5 ZO6 that he road races and he has a small trailer to carry the race tires but it looks nowhere as ridiculous as this. I didn't stick around to get a shot with cargo, but it was an older couple and they bought 2x4's, plywood and a LOT of insulation. His cart only had a few 2x4's on it and she was pushing the rest, which I also got a kick out of.
This surpasses what I previously had listed as "most ridiculous use of a vehicle," which was a customer of ours who has a snow plow on his Escalade. I also saw a '56 Cadillac made into a camper at a car show last weekend. People are wierd.